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问题 单项选择题

某患者自肩以下左侧深感觉障碍，右侧痛觉温度觉障碍，左上肢为周围性瘫痪，左下肢为中枢性瘫痪，其病变部位在

A．右侧延髓

B．左侧脊髓上颈段(颈2～4)

C．左侧脊髓颈膨大

D．右侧脊髓颈膨大

E．右侧脊髓胸段

答案

参考答案：C

单项选择题

抢救氰化物中毒最有效的急救方法是

A．快速用硫代硫酸钠

B．快速用亚硝酸钠

C．先用亚硝酸钠，接着用硫代硫酸钠

D．先用硫代硫酸钠，接着用亚硝酸钠

E．静脉注射美蓝
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单项选择题

Networks can be interconnected by different devices. In the physical layer, networks can be connected by (11) or hubs, which just move the bits from one network to an identical network. One layer up we find bridges and switches, which operate at data link layer. They can accept (12) ,examine the MAC address, and forward the frames to a different network while doing minor protocol translation in the process. In the network layer, we have routers that can connect two networks. If two networks have (13) network layer, the router may be able to translate between the packer formats. In the transport layer we find transport gateway, which can interface between two transport connections. Finally, in the application layer, application gateways translate message (14) . As an example, gateways between Internet e-mail and X.400 e-mail must (15) the e-mail message and change various header fields.

12（）

A.frames

B.packets

C.packages

D.cells
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